A natural candidate of a gravitationally interacting component is a primordial black hole (PBH). A PBH is a black hole that could have been formed in the early universe [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}. Additionally, because PBHs emit particles via the Hawking radiation induced by gravity [10]}, heavy particles produced by Hawking radiation of PBHs could also be a possible candidate for the additional DM [11]}, [12]}, [13]}, [14]}, [15]}, [16]}, [17]}, [18]}, [19]}, [20]}, [21]}, [22]}, [23]}, [24]}, [25]}, [26]}, [27]}, [28]}, [29]}, [30]}, [31]}, [32]}, [33]}, [34]}. Therefore, if mirror matter exists but cannot comprise all of the DM in the universe, we can expect that the additional DM component is related to PBHs.
